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Understanding Statistical Information on Item Analysis Reports

Understanding Statistical Information on Item Analysis Reports. www.scantron.com. Detailed Item Analysis Report. Detailed Item Analysis Report. Total points possible on this exam. Detailed Item Analysis Report. Number of students who took this version of the exam.

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Understanding Statistical Information on Item Analysis Reports

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  1. Understanding Statistical Information on Item Analysis Reports www.scantron.com

  2. Detailed Item Analysis Report

  3. Detailed Item Analysis Report Total points possible on this exam.

  4. Detailed Item Analysis Report Number of students who took this version of the exam.

  5. Detailed Item Analysis Report Standard deviation is a measure of how student scores vary from the mean score. (Used in setting grades or “grading on a curve”.)

  6. Detailed Item Analysis Report Degree of asymmetry of the distribution around its mean. Positive skewness means that scores tend to be higher. Negative skewness means that scores tend to be lower.

  7. Detailed Item Analysis Report Median score is the score that lies in the middle, when scores are arranged numerically. Example: If the student scores are 66, 78, 79, 91, & 91, the median score is 79.

  8. Detailed Item Analysis Report Mode score is the most frequently occurring score. Example: If the student scores are 66, 78, 79, 91, & 91, the mode score is 91.

  9. Detailed Item Analysis Report Highest score on the exam.

  10. Detailed Item Analysis Report The degree of peakedness or flatness seen in score distributions. A positive kurtosis means the score distribution is peaked (i.e., some students scored very high and some very low, so there is a huge difference between top and lower students) A negative kurtosis means the score distribution is flat. (i.e., everyone scored about the same, so maybe the test was too easy) A near zero value for kurtosis is a normal score distribution (i.e., a few A's, some B's, some C's, a few D's , and one or two F's)

  11. Detailed Item Analysis Report Total of scores divided by the number of scores. (Same as average score.)

  12. Detailed Item Analysis Report Measure of variability

  13. Detailed Item Analysis Report Lowest score on the exam.

  14. Detailed Item Analysis Report The consistency of the test items. If the same students took the same test on two different dates, they would have similar scores. KR20 helps in determining inconsistencies such as cheating. A reliable test will have a reliability coefficient of .70 or higher.

  15. Detailed Item Analysis Report Point Biserial (PBCC) measures how well a question discriminates between "A" students, "B" students, etc. .30 or above = very good test question .20 to .29 = reasonably good test question .09 to .19 = needs improvement below .09 = poor test question

  16. Detailed Item Analysis Report Measures how well each response discriminates between "A" students, "B" students, etc.

  17. Detailed Item Analysis Report Shows the percent of students who chose that response.

  18. Detailed Item Analysis Report This shows the percent of students who answered question one correctly.

  19. Detailed Item Analysis Report Shows what percent of the students who scored in the top 27% on the exam answered question one correctly.

  20. Detailed Item Analysis Report Shows what percent of the students who scored in the lower 27% on the exam answered question one correctly.

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